Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-2564
J Cell Biol 2004 Dec 20;1676:1037-50. doi: 10.1083/jcb.200405165.
Show Gene links Show Anatomy links

The spindle assembly checkpoint is not essential for CSF arrest of mouse oocytes.

Tsurumi C , Hoffmann S , Geley S , Graeser R , Polanski Z .


???displayArticle.abstract???
In Xenopus oocytes, the spindle assembly checkpoint (SAC) kinase Bub1 is required for cytostatic factor (CSF)-induced metaphase arrest in meiosis II. To investigate whether matured mouse oocytes are kept in metaphase by a SAC-mediated inhibition of the anaphase-promoting complex/cyclosome (APC/C) complex, we injected a dominant-negative Bub1 mutant (Bub1dn) into mouse oocytes undergoing meiosis in vitro. Passage through meiosis I was accelerated, but even though the SAC was disrupted, injected oocytes still arrested at metaphase II. Bub1dn-injected oocytes released from CSF and treated with nocodazole to disrupt the second meiotic spindle proceeded into interphase, whereas noninjected control oocytes remained arrested at metaphase. Similar results were obtained using dominant-negative forms of Mad2 and BubR1, as well as checkpoint resistant dominant APC/C activating forms of Cdc20. Thus, SAC proteins are required for checkpoint functions in meiosis I and II, but, in contrast to frog eggs, the SAC is not required for establishing or maintaining the CSF arrest in mouse oocytes.

???displayArticle.pubmedLink??? 15611331
???displayArticle.pmcLink??? PMC2172623
???displayArticle.link??? J Cell Biol


Species referenced: Xenopus
Genes referenced: bub1 bub1b ccnb1 cdc20 h2bc21 mad2l1 mbp


???attribute.lit??? ???displayArticles.show???
References [+] :
Basu, Localization of the Drosophila checkpoint control protein Bub3 to the kinetochore requires Bub1 but not Zw10 or Rod. 1998, Pubmed